we do know as you mentioned, the son was identified as the son of that teacher, professor jim crumb what was shot in the classroom. 25-year-old chris crumb who's been identified, entered the classroom and reportedly concealed the prosz cross bow in a blanket. he had several knives on him. police say that's when he shot, mortally wounding, shot from the cross bow injuring his father. but miraculously, the professor was able to stay alive long enough to struggle with his son so that six students could escape from a classroom. the local police chief praised jim crumb's actions. >> the suspect entered the classroom where professor crumb was preparing to start the day. crumb got struck with the arrow and even though mortally would be -- wounded, he was able to fight the suspect off while the students were able to escape. >> any motive as why to why this young man was so angry that he killed his dad and his dad's girlfriend. >> clearly something snapped in this 25-year-old. i spoke with a neighbor of the couple of these professors, the neighbor said the couple was very friendly, she met them l